是以外三元苗猪为主，并有杜洛克、杜长大、大约克、长白山等苗猪。
Are mainly outside the ternary and Duroc, Duroc, Yorkshire, Changbai Mountain, etc. I.
根据瞬态动力响应特性的有限元分析结果，对导苗管的结构设计提出了改进意见。
Instantaneous dynamic response characteristics of the seedling guide tube are gained, and these characteristics are theoretic bases of the...
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